Princess Promotion Manual

Jinxian traveled into a book and became the concubine of the third prince Zhang Yancheng. The original heroine was in love, mistakenly believed in the second prince, plotted to murder Zhang Yancheng, and ended up with a tragic death! In line with the principle that "a wise man does not fall in love", Jinxian decided not to talk about love, and devoted herself to assisting Zhang Yancheng in seizing the throne, gaining his trust, getting promotions and salary increases along the way, and being extremely favored. Just when she was about to become a winner in life, Zhang Yancheng suddenly had memories of her previous life, remembering how she was harmed by her in the previous life... Jinxian:...? ? ? What does the mistake made by the original heroine have to do with me, a diligent worker?